The Los Angeles County coroner's office on Friday listed the cause of death for "Star Wars" star Carrie Fisher as "sleep apnea and other undetermined factors".
Fisher had a heart attack on a flight from London to Los Angeles on December 23rd previous year and was immediately rushed to the hospital.
Carrie Fisher (right) with her mother and fellow actor, Debbie Reynolds, in February 1972.
Another factor contributing to her death was the build-up of fatty tissue in the walls of her arteries, the coroner reportedly found. The release states that the "Star Wars" actress showed signs of having taken multiple drugs, but investigators could not determine whether they contributed to her death in December.
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The full autopsy report and toxicology screening has not been released.
"The manner of death has been ruled undetermined", the report concluded.
He also said it wasn't surprising that "Carrie did drugs", he said.
The coroner also said Fisher suffered from atherosclerotic heart disease and "drug use", but no specifics were given.
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Fisher wrote extensively about her drug use and battle with mental illness from a young age.
Reynolds died the following day.
Fisher, who had written and spoken openly about her struggles in the movie business, was considered Hollywood royalty.
Carrie Fisher was best known for playing Princess Leia in the "Star Wars" films. She was treated with electroshock therapy and medication. "If you want to know what killed her, it's all of it", he said.
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She said she later dabbled in drugs like cocaine and LSD.